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Note 5 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands | Apr. 15, 2025 | Sep. 30, 2025 | Dec. 31, 2024 | Aug. 19, 2024
--- | --- | --- | --- | ---
Restricted Cash and Cash Equivalent, Noncurrent |  | $ 710 | $ 0 |
Convertible Notes [Member] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 13.00% |  | 13.00%
Sublease Amendment [Member] |  |  |  |
Sublease Term Extension, Period (Year) | 4 years |  |  |
Restricted Cash and Cash Equivalent, Noncurrent |  | $ 710 |  |
Restricted Cash and Cash Equivalent, Current |  |  | $ 1,255 |

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